Texas Instruments TPS92691QPWPTQ1

Overview

TPS92691QPWPTQ1 from Texas Instruments is an automotive-grade LED controller IC supporting boost, buck, and buck-boost topologies for constant-current LED string driving. It operates from 4.5 V to 65 V input, delivers up to 65 V output, features ±3% LED current accuracy over –40°C to 140°C, integrates rail-to-rail current sense amplifier (0–60 V common-mode), and enables >1000:1 PWM dimming - used in automotive exterior lighting systems requiring high reliability and thermal robustness.

For engineers reviewing the TPS92691QPWPTQ1 datasheet, TPS92691QPWPTQ1 pinout, TPS92691QPWPTQ1 application, or TPS92691QPWPTQ1 equivalent, key selection criteria include its AEC-Q100 Grade 1 qualification, programmable 80–700 kHz switching frequency, dual dimming support (analog IADJ + PWM + DDRV series-FET), integrated OVP/UVLO/thermal protection, and compatibility with high-side or low-side current sensing.

Technical Context

The TPS92691QPWPTQ1 implements fixed-frequency peak current mode control with programmable slope compensation and soft-start. Its rail-to-rail current sense amplifier supports 0–60 V common-mode voltage and achieves <±5 mV cumulative offset over temperature, enabling accurate LED current regulation across wide output voltage ranges.

It integrates dual gate drivers: GATE for main switch control (500 mA peak source/sink) and DDRV for external series N-FET dimming (6.1 Ω high-side resistance). Fault protection includes cycle-by-cycle current limit (525 mV IS threshold), hysteresis-based OVP (1.24 V threshold), VCC UVLO (4.1 V rising), and thermal shutdown at 175°C.

Key Specifications

Pinout & Package

TPS92691QPWPTQ1 is housed in a thermally enhanced HTSSOP-16 package (5.10 mm × 6.60 mm) with exposed PowerPAD™ for PCB ground connection and thermal dissipation. The PowerPAD must be soldered to a multi-via ground plane per TI layout guidelines.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar LED controller applications.

Compared with LM3410QMYX/NOPB and MAX20050ATC+T, the TPS92691QPWPTQ1 uniquely combines AEC-Q100 Grade 1 qualification, dual dimming (IADJ + DDRV), IMON diagnostics, and ±3% current accuracy - making it the only option qualified for safety-critical automotive exterior lighting with full fault visibility.

Availability

TPS92691QPWPTQ1 is available at Aetrix Electronics and suitable for automotive headlamp systems, commercial vehicle DRL modules, and industrial high-bay lighting requiring stable component supply, long-term lifecycle assurance, and AEC-Q100-compliant sourcing.

Supply support for TPS92691QPWPTQ1 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor leader specializing in analog and embedded processing technologies, with decades of automotive IC design expertise and rigorous AEC-Q100 validation infrastructure.

The TPS92691QPWPTQ1 belongs to TI's automotive LED controller product line, engineered specifically for high-reliability exterior lighting applications demanding precise current regulation, comprehensive fault coverage, and seamless integration into ASIL-ready systems.

FAQ

What is the maximum LED string voltage supported by the TPS92691QPWPTQ1?

The TPS92691QPWPTQ1 supports an output voltage range up to 65 V, enabling it to drive LED strings with forward voltages spanning 2 V to 65 V. This accommodates configurations from single high-V_f LEDs to strings of 20+ white LEDs. The rail-to-rail current sense amplifier maintains accuracy across this full range, with CSP/CSN inputs rated for 0–60 V common-mode voltage - verified in the datasheet's Electrical Characteristics table under "Current Sense Amplifier" section.

Does the TPS92691QPWPTQ1 support both high-side and low-side current sensing?

Yes, the TPS92691QPWPTQ1 supports both high-side and low-side current sensing configurations. Its rail-to-rail current sense amplifier accepts CSP and CSN inputs over a 0–60 V common-mode voltage range, allowing direct connection across the sense resistor regardless of whether it is placed between the LED cathode and PGND (low-side) or between VIN and LED anode (high-side). This flexibility is explicitly stated in the "Features" section and confirmed in the "Detailed Description" subsection 7.1.

How does the DDRV pin function in the TPS92691QPWPTQ1?

The DDRV pin on the TPS92691QPWPTQ1 is a dedicated gate driver output that controls an external N-channel MOSFET placed in series with the LED string. It enables high-contrast PWM dimming (>1000:1) independent of the main switching regulator, preserving constant-current regulation while modulating light output. DDRV provides 500 mA peak drive capability and features 6.1 Ω high-side resistance - specifications documented in Section 6.5 "Electrical Characteristics" under "PWM Gate Drive Output (DDRV)".

What is the operating temperature range for the TPS92691QPWPTQ1?

The TPS92691QPWPTQ1 is qualified to AEC-Q100 Grade 1, specifying an operating junction temperature range of –40°C to +140°C and an ambient temperature range of –40°C to +125°C. Thermal protection includes shutdown at 175°C with 25°C hysteresis. These ratings are listed in Section 6.3 "Recommended Operating Conditions" and Section 6.5 "Electrical Characteristics" under "Thermal Shutdown".

Can the TPS92691QPWPTQ1 be synchronized to an external clock?

Yes, the TPS92691QPWPTQ1 supports external clock synchronization via the RT/SYNC pin. An external clock signal can be AC-coupled through a 100 nF capacitor to synchronize the internal oscillator. The device requires the external clock frequency to be within ±20% of the RT-set frequency and specifies minimum pulse width (100 ns) and threshold levels (2.7 V rising, 1.8 V falling). This functionality is detailed in Section 7.3.2 "Oscillator" and Figure 19 of the datasheet.